Lathe for turning handles



(No Model.) 3 Sheets-Sheefi 1. P. T. LAMKIN.

LATHE FOR TURNING HANDLES. No. 430,862. Patented June 24, 1890.

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WiLYIEEEE'E lrn/ev llmn FEYTB TLELTll klll (No Model.) 3 Sheets-Sheet 2. P. .T. LAMKIN. LATHE FOR TURNING HANDLES. v No. 430,862. Patented June 24, 1890.

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PERRY LAMKIN, OF WI-IITTAKER, MICHIGAN.

LATHE FOR TUR SPECIFICATION forming part of Letters NING HANDLES.

Patent No. 430,862, datedJune 24, 1890.

Application filed December 4, 1889. Serial No. 332,497. (No model.)

To all whom it may concern:

Be it known that I, PERRY T. LAMKIN, a citizen of the United States, residing at Whittaker, in the county of VVashtenaw and State of Michigan, have invented certain new and useful Improvements in Lathes for Turning Handles, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to new and useful improvements in lathes for turning regular work--such as handles, &c.-and which are commonly known as lathes for turning handles, and the invention consists, first, in the improved construction and operation of the cutter; second, in providing the machine with an easy adjustment, whereby handles of dif ferent diameters may be turned without changing the pattern; third, in the use of self-centering feed-rolls; fourth, in the peculiar construction, arrangement, and combination of parts, all as more fully hereinafter described, and shown in the accompanying drawings, in which- Figure l is a plan view of my handle-lathe. Fig. 2 is avertical central longitudinal section thereof, lookin g from the rear toward the front of the machine. Fig. 3 is an end elevation with some of the parts omitted. Fig. 4 is an enlarged central section of the hollow mandrel. Fig. 5 is asection on line :20 a; in Fig. 4. Fig. 6 is an elevation of the roughing cutterhead. Fig. 7 is a cross-section on line y y in Fig. 6.

The frame of the machine is preferably constructed of cast-iron frames A and A, joined together by suitable cross-braces B.

G is the main shaft, journaled in suitable brackets in the rear of the machine and carrying the tight and loose pulleys E and E, drive-pulley E, and cone-pulley F. G is another shaft mounted parallel thereto near the top of the frame, having the cone-pulley G, corresponding to the cone-pulley F on the shaft C. The shaft G is provided with the worm a, adapted to engage with the wormgears 12 011 the feed-shaft H, H, and H, ar ranged in pairs above and below the shaft G and at right angles thereto. Each pair of feedshafts is yoked together at the front end by links K, pivotally connected to the levers J at points on opposite sides of their fulcrums and equidistant therefrom. A pressureweight K is applied to each lever.

L is a hollow mandrel journaled in bearings L to the frame of the machine and having mounted upon it the heads M and N, sleeve 0, and pulley P. To the head M is adjust ably secured the roughing-knife M by means of the segmental clamping-plate c, which is secured between two clamping-ribs c and c by means of a set-screw cl. (Shown in Figs. 6 and '7.) The head N forms a face-plate, to which is pivotally secured at ethe movable face-plate N, which has a central aperture of sufficient size for the passage of the mandrel and to provide for a limited play of said faceplate on its pivot-pin. A tap-bolt e, passing through a curved slot in the head N and en-' gaging into the face-plate N, serves both to limit the movement of the latter and to keep it into contact with the head N.

N- is a knife adjustably secured to an ear f on the face-plate N in proximity to the pivot e, and, extending therefrom, passes with its cutting-edge through an aperture 9: in the hollow mandrel.

O is a sleeve on the mandrel L, carrying the arm 0', the free end of whichpasses through a slot #2 in the plate N at a point opposite, or nearly so, the pivot e and slidingly engages into a bearing in the head N.

O- is a link, one end of which is pivotally secured to the arm 0" and the other end to the ear h on the plate N at such an angle to the arm 0 that the sliding of the sleeve 0 from or toward the head N will swing the plate N on its pivot.

P is a feather on the mandrel, engaging in a feather-way in the sleeve 0.

Q is a collar loosely fitting in an annular groove Q in the sleeve and carried between the bifurcated end of the rock-arm R, all so arranged that the sleeve 0 is free to slide on the mandrel L in a longitudinal direction, while the feather P, engaging in the featherway P, revolves the sleeve with said mandrel. At the same time the motion of the sleeve produces a corresponding movement of the face-plate N through the medium of the arm 0 and link 0, which together form a toggle, that as the sleeve approaches or re cedes moves the face-plate on its pivot to one side or the other, thereby carrying the knife out or in from the center of the mandrel from or toward the work. I

R is a rock-shaft, one end of which is secured in pivotal bearings on the cross-bar S of the frame and the other end in the horizontally-sliding bearing S.

S is a rod screw-threaded at one end and engaging in an ear 2' on the bearing-S, while the other end passes through a bearing and is provided wit-h a handle 70 to turn it conveniently.

Z is a set-screw for securing the bearing S in any adjusted position.

R is a rock-arm secured to the rock-shaft R, the free end of which is bifurcated, embracing the collar Q and pivotally connected thereto.

T is a lever attached to the shaft R near its center, one end of which is provided with a weight T and the other with an anti-friction roller T, which engages with the under side of the cam-shaped pattern-wheel U,which latter is actuated by a suitable train of gearing from the feed-shaft H.

W, WV, and W are feed-rollers mounted in pairs on the feed-shafts H, H, and H, respectively, and in the same vertical plane with the centers of the mandrel. The first pair of feed-rolls WV are preferably provided with V-shaped grooves to feed the square. sticks into the mandrel, while the feed-rolls W and W, which receive the handle when turned, are preferably made of rubber with rounded grooves, so as not to injure the finished surface.

In practice, the parts being arranged as shown and described, they are intended to operate as follows: Motion being communicated to the shaft 0, it is conveyed by belts connecting the pulleys E and P and conepulleys F and G to the hollow mandrel L and shaft G, respectively, from the latter of which it is communicated to the feed-shafts H, H, and H through the medium of the worm-gearing. The operator feeds the square stick between the rolls WV, which carry it to the head M, where the roughingknife rounds it, making it small enough to readily enter the hollow mandrel through which it is fed. At the same time, motion being communicated from the shaft II to the pattern-wheel, it will be seen that anyirregularity in the periphery of said wheel will produce amovement of the lever T andacorresponding movement of the rock-arm R which in turn moves the sleeve 0, thereby oscillating the cutting-edge of the knifel from or toward the center of the mandrel, as before described. Thus by using a suitable pattern-Wheel any desired shape of handle maybe made. By adjusting the screw S the bearing S may be moved backward or forward, thus making the handles of greater or less diameter. By yoking the feed-shafts together in the manner described the feedrolls are always kept equidistant from the con ter of the mandrel, thus making self-centering feed-rolls.

What I claim as my invention is- 1. In a handle-turning lathe, the combination, with the revolving hollow mandrel, of a cutter-head consisting of a face-plate N, se- 7 operate upon the work in the mandrel through an aperture g formed therein, a sliding sleeve upon the mandrel controlled by a pattern-. wheel, and suitable connection between said sliding sleeve and the face-plate N for correspondingly swinging the latter upon its pivot to draw the knife from or toward the work, substantially as described.

2. In a handle-turning lathe, the combination of the mandrel L, provided with the aperture g, the cutterhead consisting of the swinging face-plateN,Which carries the knife, and the face-plate N, fast uponthe mandrel, and to which the face-plate Nis pivotally secured free to swing, whereby the cutting-head of the knife is tangentially adjusted from or toward the work in themandrel, the sliding sleeve 0 upon the mandrel, controlled by a pattern-wheel, the bar 0, carried by said sliding sleeve, and the link 0, pivotally connecting the bar 0 and the face-plate N, substantially as described.

3. In a handle-turning lathe, the combination of the mandrel L, provided with the aperture g, through which the knife operates upon the work, the cutter-head consisting of the face-plate N, fast upon the mandrel, and the face-plate N, free to. swing thereon on a pivot e and carrying the knife, the sliding sleeve 0, controlled by a pattern-wheel, the bar 0, secured to it and slidingly engaging into a bearing on the face-plate N, and the link 0, pivotally connecting the bar 0 and face-plate N, substantially-as described.

at. In a handle-turning lathe, the combination, with the revolving hollow mandrel and its cutter-head having the swinging face-plate N, carrying the knife, the sliding sleeve 0 upon the mandrel, the bar 0 and link O, adapted to swing the face-plate by the movement of the sliding sleeve 0, the pattern-wheel U, the rock-shaft R, provided with the lever T, bearing upon the pattern-wheel, and with the arm R, carrying the sliding sleeve, and the slidingly-adj ustable bearing S of said rockshaft, substantially as described.

In testimony whereof I affiX my signature, in presence of two witnesses, this 12th dayof August, 1889.

PERRY T. LAMKIN.

IVitnesses:

CHARLOTT BISHOP, WILL BISHOP.

ITO 

